CVE-2026-42392

Medium

Description

An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH functionality. Update to non-vulnerable version. No publicly available exploits are known.

SeverityMedium

CVSS4.3

Exploit probability—

ProductOX Dovecot Pro

PublishedAug 28, 2026

First seenAug 28, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

Open-Xchange GmbH OX Dovecot Pro3.1.6 or later
Open-Xchange GmbH OX Dovecot CE2.4.5 or later

Vendor advisories

documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

Affected products

Product	Affected versions	Fixed in
Open-Xchange GmbH OX Dovecot Pro	2.3.0 ≤ v < 3.1.6	3.1.6
Open-Xchange GmbH OX Dovecot CE	2.3.0 ≤ v < 2.4.5	2.4.5

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